Background of the issue:
I am trying to add the purchased credits to cms.uni-mainz.de. I deleted the key from the test site and deactivated WPML on the test site, but this site still appears. I then try to add the credits, to no avail. Link to a page where the issue can be seen: https://wpml.org/account/manage-credits/
Symptoms:
I expected to see success, with the credits now available to cms.zdv.uni-mainz.de. Instead, I got the error message: 'Something went wrong, please try again later.'
Questions:
Why does the test site still appear after deactivating WPML and deleting the key?
How can I successfully add the purchased credits to cms.uni-mainz.de?